Grate-bar



(No Model.)

F. 1V1. FERGUSON.

GRATB BAR.

Patented July 1, 1890.

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UNITED STATES PATENT. OFFICE.

FERGUS M. FERGUSON, OF HOBOKEN, NEW JERSEY, ASSIGNOR TO GEORGE H. CLARKE, OF BROOKLYN, NEV YORK.

GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 431,204, dated .Tuly 1, 1890.

Application filed October 7, 1889. Serial No. 326,227. (No model.)

T all whom it may concern:

Be it known that I` FnRGUs M. FERGUSON, a citizen of the United States, residing at Hoboken, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in Grate-Bars; and the following is declared to be a full, clear, and exact description of the same.

My invention is designed as an improve- 1o ment upon the grate-bar set fort-h in Letters Patent granted to O. D. Rogers .I une 22, 1886,

No. 844,203. In this patent the grate-bar is composed of transverse bars and connectingbands or edge ties, between which there are t5 air-spaces, and below vthe transverse bars there are longitudinal supporting-ribs cast with the transverse bars, which ribs virtually divide the air-spaces into three parts-viz., central and outside air-spaces. Coal and olinkers often lodge in and choke upthese outside air-spaces, and the object of my present invention is to overcome this difficulty.

In carrying out my invention I construct a grate-bar similar to the one described in the aforesaid patent, except that I arch the under sides of the edge ties, (adjacent to each of the narrow outer air-spaoes,) to come above the top edges of the supporting-ribs, so that the edge ties are of narrower depth than the depth of the parallel transverse bars. This lengthens and increases the space between the inner surface of the edge ties and the l upper edge of each longitudinal supportingrib, providing more room for ascending air and descending particles of coal or clinkers. In the drawings, Figure 1 is a plan View of a grate-bar provided with my improvement. Fig. 2 is a side elevation of the same, and Fig. is a cross-section at the line x The cast-metal grate-bar is composed of the transverse bars d, the edge ties f, and the longitudinal supporting-ribs a a, beveled at their top edges. Between the lateral or transverse bars CZ there are air-spaces, which are divided into the central portion c and the narrow outside portions c by the ribs a a. These transverse bars CZ and the air-spaces between them may be of various shapessuch, for instance, as those shown in Figs. l, 7, 8, 9, and of the aforesaid patent-without departing from the spirit of this invention, the form shown in said Fig. l0 being that shown in the drawings of the present case.

The connecting edge ties f are o'f narrower 5 5 depth than the depth of the transverse bars cl, so that the under edges of the ties f are above the top edges of the supporting-ribs a o., thus forming arch-shaped openings e, each of which is adjacent to each of the narrow 6o outer air-spaces c. The edges 4 of the metal of the ties f may be made at right angles to the vertical surfaces of the tie; but I prefer to taper the part, as shown in the cross-section 3. The edge ties f being of less depth than the bars d, and their under edges being above the top edges of the ribs d, lengthens the air-spaces between the inner surface of the ties and the upper edges of the longitudinal ribs, and at the same time increases 7o the area through which clinkers, cinders, and ashes may pass freely into the ash-pit under the grate-bar without the risk that heretofore existed of clogging up such air-spaces. In consequence of the under surfaces of the edge bars f being above the top edges of the supporting-ribs a the openings for the escape of ashes is narrowest between the top of the V-shaped surface of the ribs a and the lower edges of the edge. bars, and ashes and 8o,

clinkers do not Wedge into the opening, but fall away. Vhere the lower edges of such bars f are in line with the bottom. of the V- shaped surfaces of the ribs, as in bars before made, the openings are contracted in such a way that ashes and clinkers wedge therein.

I claim as my invention- The improved grate-bar herein described, the same consisting of the longitudinal supporting-ribs da, beveled at the top edges, the 9o parallel transverse bars d and the edge ties j', forming the fire-surface, said edge ties f being of narrower depth than the depth of the transverse bars, and their under edges being above the top edges of the supporting-ribs, substantially asand for the purposes set forth.

Signed by me this 3d day of October, A. D. 1889.

F. M. FERGUSON.

. Vitncsses: p

Gno. T. PINGKNEY, WILLIAM G. MorT. 

